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Model 291-95
© 2004 Xantech Corporation
CAUTION:
With any of these systems, be sure the 781-RG Power Supply is plugged into an un-switched AC outlet. This
maintains the 490 system in "stand-by" operation so that power-on commands can be sent to the controlled equipment.
TROUBLE SHOOTING
For a complete listing of Trouble Shooting techniques for IR based systems, please visit our Web Site at
www.xantech.com
and click on PRODUCTS and then select Application Advisories. Application Advisory AA-03 is a
complete IR Trouble Shooting Guide.
For non-operation or intermittent control try the following:
1. The most common indication of IR interference is if the 291-95’s TB LED is ON constantly or flickers often. This
can be caused by numerous sources of Interference:
a.
RF Interference: Depending upon the surrounding environment and Wire Run Lengths, RF interference
can cause the Talk Back LED to Flicker often or cause the LED to be on Constantly. Examples sources of
RF Interference can be from TV Transformers, Dimmer Circuits, Large Power Supplies, High Current
Electrical Lines, and PC Equipment.
•
Isolate the source of the interference by turning off suspected sources and seeing if proper IR
control can be achieved. Try relocating the 291-95 to minimize effects from the interfering RF
source.
•
If the RF source is coupling into the wire itself, try re-routing the wire isolating it from the
interfering source or try the following:
1. Increase the wire gauge for the IR Receiver
2. Use a shield as a DRAIN connecting it to GND on the Connecting Block side ONLY.
Note:
Do not connect the Shield at both ends as this can cause Capacitive interference.
3.
If using CAT5 Wire you must utilize all 8 conductors of the wire.
Use all 4 White
Stripe wires for the GND connection, 2 Solid Wires for 12VDC and the last 2 Solid Wires
for IR Signal. This will ensure that all lines are properly coupled to GND to minimize RF
interference through the wire.
4. Connect a GND wire from the Connecting block terminal to an electrical GND (See
Figure 4 below).
283M
Blink-IR
Mouse Emitter
To 120 V AC
(unswitched)
781RG
Power Supply
789-44
Connecting Block
283M
Emitter
283M
Emitter
Equipment Rack
Hand Held
Remote
VCR
291-95
Hidden Link
Plasma-Friendly
IR Receiver
12VDC
+12 VDC
GND
STATUS
IR IN
EMITTERS
IR
RCVR
789-44
CONNECTING BLOCK
®
Satellite Receiver
AV
Receiver
Use 16AWG
Wire from GND
on the Connecting Block
to a cold water
GND.
Figure 4 – Addition of System GND Wire for RF Interference Reduction
b.
As mentioned above in the section labeled PLACEMENT, PLASMA interference can be reflected off of
any item within 3 ft. of the Plasma Display.
•
Check for reflected items and move the location of the 291-95 (or reflecting object) accordingly
to minimize interference.
•
Please visit www.xantech .com for a complete listing of IR Trouble Shooting Techniques!
XANTECH CORPORATION
13100 Telfair Avenue, Sylmar CA 91342-3829
phone 818.362.0353 • fax 818.362.9506
Part No. 08905030 Rev A 09-07-04
